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Transaction Count represents the total number of commits
and rollbacks performed during a sample period. This statistic is an indication of how much work is being accomplished within the database. A spike in the transaction rate may not necessarily be bad. If response times stay close to normal, it means your system can handle the added load. Actually, a drop in transaction rates and an increase in response time
may be indicators of problems. Depending upon the
application, transaction loads may vary widely across
different times of the day.

TCount = deltaCommits + deltaRollbacks

deltaCommits: difference of \'select value from v$sysstat where name=\'user commits\'\' between sample end and start

DeltaRollbacks: difference of \'select value from v$sysstat where name=\'user rollbacks\'\' between sample end and start